I think poor sleep can be caused by ADHD, and can cause children without ADHD to exibit the behaviors common to ADHD.

Here's a link to an article by Peg Dawson, author of 'Smart but Scattered' a very helpful book about helping kids develop their executive function.

http://www.nasponline.org/resources/health_wellness/sleepdisorders_ho.aspx

((hugs and prayers)) through this difficult transition,
Grinity

Coaching available, at SchoolSuccessSolutions.com